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Assembly and Secondary Operations

Steel Rule DiecuttingIf your thermoformed plastic parts need hinges, handles, inserts or fastening devices, our technicians at the Akra Plastics can integrate them into the final assembly. This means that you’ll receive your parts fully ready to use or integrate with your product.

Bonding and Cementing
Many thermoplastics can be fastened together to form strong bonds using chemical adhesives or solvents.
This type of bonding works extremely well with plastic materials such as acrylic, PVC and ABS. However, this process does not currently work as well with high molecular weight plastics such as Ultra High Molecular Weight Polyethylene (UHMW). As a rule, polyolefins don’t bond well with solvents or adhesives. However, there are many new adhesives under development that will make it easier to bond these materials in the future.

Typically, surfaces to be bonded are cleaned and made smooth prior to introduction of the cement.

Cementing Plastics
If solvent cement is used, it actually melts the materials being joined. When the solvent evaporates, the materials have melted together to form a solid joint or bond. Solvent bonding, or chemical welding, is used extensively in the creation of acrylic Point of Purchase (POP) displays.

An adhesive cement will bond the material by adhering itself to the pieces being joined, providing a solid bridge between the parts. Adhesive cement is used with similar materials to achieve particular types of joints and is used when dissimilar materials need to be joined.

Akra has years of expertise when it comes to cementing parts together. We use a combination of cementing fixtures and gluing techniques, with the proper cements, to achieve parts that are both functional and aesthetically pleasing

Mechanical Fastening
Akra uses various mechanical fasteners depending on the application. Akra uses many types of fasteners from Pop rivets, tubular rivets, solid rivets, binding posts and various threaded inserts for attaching hinges, latches, handles, etc.

Ultrasonic Welding
Ultrasonic Welding is a means of fastening two similar or dissimilar, materials together without the use of mechanical fasteners. It differs from hot gas Plastic Welding in that it melts the parent materials together to form the weld rather than adding additional material to the process.

Ultrasonic Welding uses high frequency sound waves to soften the material and melt the pieces of thermoplastic together. Parts are held together under pressure and the ultrasonic vibration is applied. Welding time is typically very short.

Ultrasonic Welding can be used in applications where:

Mechanical fasteners can’t be used

The area to be fastened is hard to reach

Primary surface aesthetics are a concern

Steel Rule Diecutting
A process Akra uses in cutting flat sheet with tight tolerances to trimming formed parts.

Drilling and Tapping
Drilling and tapping of plastics is similar to the processes used for wood and metals.

In drilling plastics, the primary difference is that plastic drill bits typically have sharper points and different rake angles than bits for other materials. To prevent melting during drilling, Midland adjusts drill-and-feed speeds according to the material being used

Tapping is simply the process of putting threads in a pre-drilled hole. To ensure that the threads are straight and clean, Akra uses special tapping heads.

Finished Goods Assembly

In addition to plastic custom component manufacturing, Akra can often supply basic mechanical assembly operations also. Whether it is for sub-assembly, or complete assembly of your part, we have the resources available.

Assembly of items such as latches, locks, pins, threaded inserts, labels, pad printing and silk screening are often needed to complete your part. We can provide these services.

So, besides manufacturing your plastic component part(s), we can take production services one step further and assemble your parts too.